feat: add MiniMax TTS provider - #39

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

'RollingSummaryCompactionResult' is defined but never used. Allowed unused vars must match /^_/u

'RollingSummaryPhaseResult' is defined but never used. Allowed unused vars must match /^_/u

'AdaptiveExecutionDecision' is defined but never used. Allowed unused vars must match /^_/u

'StandaloneMemoryRollingSummarySinkOptions' is defined but never used. Allowed unused vars must match /^_/u

'StandaloneMemoryLongTermRetrieverOptions' is defined but never used. Allowed unused vars must match /^_/u

'ITurnPlanner' is defined but never used. Allowed unused vars must match /^_/u

'StreamId' is defined but never used. Allowed unused vars must match /^_/u

'runWithSpanContext' is defined but never used. Allowed unused vars must match /^_/u

'startAgentOSSpan' is defined but never used. Allowed unused vars must match /^_/u